It was a derivative of the BT23 Formula 2 car and its BT23A Tasman derivative built with Climax engines for libre racing. Of the three built, two were used in hillclimbs and the third in libre racing. It was the libre racing car that ended up doing some Formula A in Canada and was allowed to start a GP.

Jack Smith later brought the car back to the UK and was killed in it at Snetterton in July 1972.